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v2.4.1.9

Profit Sharing Plan (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Deferred Compensation Arrangements [Abstract] |  |  |
Maximum percentage of compensation employee is allowed to contribute | 15.00%mcy_MaximumPercentageOfCompensationEmployeeIsAllowedToContribute |  |
Matching contributions | $ 8.0 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | $ 8.1 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | $ 7.2 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount | $ 19.2 mcy_IndividualEmployeesBonusExpenseCash | $ 0 mcy_IndividualEmployeesBonusExpenseCash | $ 10.0 mcy_IndividualEmployeesBonusExpenseCash

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- Definition Individual Employees, Bonus Expense, Cash + References No definition available. + Details
Name: | mcy_IndividualEmployeesBonusExpenseCash
Namespace Prefix: | mcy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Maximum percentage of compensation employee is allowed to contribute to the Plan. + References No definition available. + Details
Name: | mcy_MaximumPercentageOfCompensationEmployeeIsAllowedToContribute
Namespace Prefix: | mcy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DeferredCompensationArrangementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration